Saturday, April 08, 2006

Finding Sheep -> Pigs on the Wing?

In a latent topic model (aspect model), each document has an associated distribution over latent topics (the mixing proportions). Here, the topics of the scene are mostly composed of the grass and sheep topic.

The mixing proportions on the graph above were obtained using the variational inference procedures that Jon and I wrote for our MATLAB implementation of Latent Dirichlet Allocation.